I heard about the Pig through a friend who was staying in the studios up by DePaul. Naturally, the DePaul/Sheffield clientele is huge -- expect to hear premed students studying & chatting away on the second floor.
A place like this makes for a great getaway. Cramped, broken-in, full of character. The second floor is the perfect place to put in five hours on the laptop while nursing a cup of the most exotic tea you could think of. The floors are grungy, creaky hardwood with plenty to line the walls, from old funky pictures to bookcases. Don't come hungry. Rather, don't come hungry and poor. The food menu is a bit overblown, and too expensive. I'd lose the gimmicky, literary sandwiches with fancy ingredients and simplify -- the college crowd wouldn't miss it. The coffee menu has you covered whatever your tastes, and the aforementioned tea selection is said to be the largest.
A great getaway. Make it your new library -- it sorta feels like one already, except the "Catcher in the Rye" is tastier.